Sharpening machine



Oct. 20, 1925. 1,558,194

M. L. LUEBBEN SHARPENING MACHINE Filed Dec. 19, 192,3 2 Sheets-Sheet 1 I NVENTOR v MELCi-HOR L. LUEBBliN, -u I$IOFW%OMSX Oct. 20, 1925. 4 1,558,194

' M. L. LUEBBEN SHARPENING MACHINE Filed Dec. 19, 192,; 2 Sheets-Sheet 2 INVENTOR MELCHlOR L. LUEBBEN- Patented Oct. 20, 1925.

UNITED STATES V 1,558,194 PATENT OFFICE.

MELCHIOR I. LUEBBEN, OF ST. LOUIS, MISSOURI, ASSIGNOB TO LUEBBEN PRODUCTS COMPANY, OF ST. LOUIS, MISSOURI, A CORPORATION OF MISSOURI.

- SHALRPENING MACHINE.

Application filed December 19, 1923. Serial No. 681,494.

To all whom it may concern:

Be it known that I, MELCHIOR L. LUEBBEN, a citizen of the United States of America, residing at the city of St. Louis, in the State of Missouri, have invented certain new and useful Improvements in Sharpening Machines, of which the following is a specification, reference being had thereinto the accompanying drawing.

My invention relates to improvements in sharpening machines and has for its object to provide a machine having two rotary sharpening disks yielding'ly mounted together, preferably upon the same shaft, their meeting faces beingcontoured to provide a sharpening groove and to provide adjustment for wear in said groove; the

machine also having a guide for the tool being sharpened and an auxiliary guide on the outer face of one of said disks for use in the sharpening of shears and the like.

While the machine may be driven by any desired source of power I have provided a compact'hand-operated gear for that purpose.

Other incidents of my invention will appear in the descriptive portion of this specification.

Dru/wings.

Fig. 1 is an elevation of a machine embodying my invention, taken from the side containing the driving gear.

Fig. 2 is a front elevation of the same.

Fig. 3 is an elevation taken from the side opposite to that shown in Fi 1.

Fig. 4: is a top plan view of said machine.

Fig. 5 is a vertical mid-sectional view of the grinding disks, exhibiting the details of their coupling Fig. 6 is a plan view'of the inner face of the fixed or inner disk, and Fig. 7 a like view of the inner face of the outer disk.

Description.

beveled faces 1919 extending from the bottom of the groove 17 to the outer edge of said cavity 18; I prefer that said beveled faces 19-19 should incline inwardly at an angle of five degrees or more from the plane of the bottom of the groove 17.

The disk A is rigidly fixed on the shaft 10, the disk B being relativel loosely mounted thereon but having a ork composed of two coupling fingers 20-20 loosely engaging with the flattened sides of the stud 21, which stud 21 projects beyond the inner face of the disk A in the cavity 18.

On the outer face of the disk B is mounted the annular beveled button 22 whose beveled inner face forms a shears-guide 25 to aid in grinding shears and the like against the outer face of the disk B.

A coiled-spring 23 is mounted on the shaft 10 and bears against the outer face of the button 22 with sufficient force to keep the groove 17 closed and the inner faces of the disks A and Bin contact at the line indicated as 24.

Mode of operation.

For edged tools other than those having a beveled edge the sharpening is effected by resting the tool against the guide 16 with its edge in the groove 17. As the groove 17 becomes worn by use the disks A and B are kept in contact by the pressure of the spring 23. The described loose coupling of the disks A and B I have found to facilitate and improve the operation of grindin to a degree impossible to accomplish if sai disks and B are rigidly coupled; the flexible coupling aids in settling the edge being sharpened within the groove 17.

For sharpening shears and scissors the outer face of the disk B is used, the tool resting in the shears-guide 25.

I have thus described the preferred form of embodiment of my invention, and my description is explanatory of its principles and mode of o eration. Other structures could be devise to accomplish like results without departure from my invention as defined in the appended claims.

Thus the form and dimensions of the cavity 18 are capable of a wide latitude of variation, save that at its outer conver edges, which I have illustrated as the aces 19-19 it should communicate directly with the bottom of the groove 17, in order that,

as the outwardly diterging faces of the groove 17 are worn by use the disks A and B will remain seated together and in contact with each other at the bottom of said groove 17 and the contour of said groove 17 be maintained. As an incident of this con struction any deposit found by oil, grease or water (which may be used as lubricants during the grinding process) in the bottom of the groove 17 will seep into the interior of the cavity 18 or, be forced therein b the pressure of the tools being ground, an will not (as is the case in other double-disk grinding machines) accumulate between the disks A and B, forcing them apart and distorting the desired angulation of the converging walls of the grinding groove 17.

1. 'An implement sharpening assembly comprising a pair of rotary abrading disks, a face of each disk being inclined in opposite directions from an annular apical point constituti a sharp line concentric with the axis 2% the disk, said lines of the respective disks registering and in contact with each other whereby to form grinding contacts with an edged instrument, in combination with means for holding the disks yieldably in contact and driving them in unison.

2. An implement sharpening assembly comprising a pair of like rotary abrading disks, a face of each disk being inclined in opposite directions from an annular apical point constituting a sharp line concentric with the axis of the disk, said lines of the respective disks registering and in contact with each other whereby to form grinding contacts with an edged instrument, in combination with means for holding the disks yieldably in contact and driving them in unison.

3. An implement sharpening assembly comprisin a support, a driving shaft carried there y, a stud fixed with reference to the driving shaft, sharpening disks, one of said disks secured to the shaft and the other loosely mounted thereon, a coupling device carried by said loosel mounted disk and engaging said stud w ereby to cause said disks to rotate in unison, the opposed surfaces of said disks being irregular in contour and registering to form spaces between the disks on both sides of a median plane extending at right-angles to the shaft, the irregular contours of each disk outlining a cavity adjacent the central portion of the disk and a beveled surface extending from the walls of the chamber to a common annular point of contact between the disks.

4. An implement sharpening assembly comprisin a support, a driving shaft carried there y, sharpening disks, one of said disks fixed on the shaft and the other loosely mounted thereon, a coupling device carried by said loosely mounted disk, means carried by the shaft for engagement with the coupling device whereby to cause said disks to rotate in unison, the opposed surfaces of said disks being irregular in contour and registering to form symmetrical spaces tween the disks, the irregular contours of each disk outlining an enlarged cavity adjacent the central portion of the disks and adapted to form in assembly a symmetrical chamber for receiving the coupling means and a beveled surface extending from the walls of the chamber to a common point of contact between the disks, and means impelling the loosely mounted disk toward the fixed disk.

In testimony whereof I have hereunto afiixed my signature.

' MELCHIOR L. LUEBBEN. 

